docs: Minor fixes to Watch Faces design guidelines.
docs: Minor fixes to Watch Faces design guidelines.

Change-Id: I1b9c26d12bac1b5e5d649e7ea665f58b50d621d7

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base